Valve assemblies for heating devices

ABSTRACT

In certain embodiments, a valve assembly can comprise a housing, a valve body and a nozzle. The housing can define a first inlet and a second inlet. The valve body can be positioned within the housing and configured to rotate between a first position for a first fuel type and a second position for a second fuel type different from the first. A control knob is operatively coupled to the valve body and to an air shutter such that rotation of the control knob controls the state of the valve body and the position of the air shutter.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/662,290, filed Oct. 26, 2012, which is a continuation of U.S. patentapplication Ser. No. 12/581,758, filed Oct. 19, 2009, now U.S. Pat. No.8,297,968, which is a continuation of U.S. patent application Ser. No.11/649,976, filed Jan. 5, 2007, now U.S. Pat. No. 8,011,920, whichclaims the benefit of U.S. Provisional Application No. 60/871,761, filedDec. 22, 2006; the entire contents of all of the above applications arehereby incorporated by reference herein and made a part of thisspecification. Any and all priority claims identified in the ApplicationData Sheet, or any correction thereto, are hereby incorporated byreference under 37 CFR 1.57.

BACKGROUND OF THE INVENTIONS

1. Field of the Inventions

Certain embodiments disclosed herein relate generally to heatingdevices, and relate more specifically to fluid-fueled heating devices.

2. Description of the Related Art

Many varieties of heaters, fireplaces, stoves, and other heating devicesutilize pressurized, combustible fuels. Some such devices operate withliquid propane, while others operate with natural gas. However, suchdevices and certain components thereof have various limitations anddisadvantages.

SUMMARY OF THE INVENTIONS

In certain embodiments, an apparatus can comprise a dual fuel pilotassembly. The dual fuel pilot assembly can comprise a first fueldispenser configured to deliver a first fuel, a second fuel dispenserconfigured to deliver a second fuel different from the first; and atleast one of a thermocouple configured to couple with a feedback line,and a thermopile configured to couple with a power line. Heat fromcombustion of either the first fuel or the second fuel can be directedtoward the at least one of the thermocouple and the thermopile.

In some embodiments an apparatus can include a pilot assembly. The pilotassembly can comprise a first fuel dispenser, a second fuel dispenser,an igniter and at least one of a thermocouple, and a thermopile. Thepilot assembly can be configured to direct heat from combustion of oneof either a first or a second fuel to the at least one of thethermocouple and the thermopile. In some embodiments, the firstdispenser can include a plurality of first ports and the seconddispenser can include a plurality of second ports.

According to some embodiments an apparatus can include a pilot assembly.The pilot assembly can comprise a first fuel dispenser, a second fueldispenser, an igniter and at least one of a thermocouple, and athermopile. The first fuel dispenser can be in fluid communication witha first pilot delivery line. The second fuel dispenser can be in fluidcommunication with a second pilot delivery line. The igniter can connectto an igniter line. The thermocouple can connect to a feedback line. Thethermopile can connect to a power line.

Certain embodiments of apparatus comprise a pilot assembly where thepilot assembly includes a first fuel dispenser that can be configured tocouple with a first pilot delivery line and deliver a first fuel, asecond fuel dispenser that can be configured to couple with a secondpilot delivery line and deliver a second fuel, and an electrode origniter that can be configured to couple with an igniter line. The pilotassembly may further include at least one of a thermocouple configuredto couple with a feedback line, and a thermopile configured to couplewith a power line.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an embodiment of a heating device.

FIG. 2 is a perspective view of an embodiment of a fuel delivery systemcompatible with the heating device of FIG. 1.

FIG. 3 is a perspective view of an embodiment of a valve assemblycompatible with, for example, the fuel delivery system of FIG. 2.

FIG. 4 is an exploded perspective view of the valve assembly of FIG. 3.

FIG. 5A is a front elevation view of an embodiment of a valve bodycompatible with the valve assembly of FIG. 3.

FIG. 5B is a cross-sectional view of the valve body of FIG. 5A takenalong the view line 5B-5B.

FIG. 5C is a cross-sectional view of the valve body of FIG. 5A takenalong the view line 5C-5C.

FIG. 5D is a cross-sectional view of the valve body of FIG. 5A takenalong the view line 5D-5D.

FIG. 6 is a cross-sectional view of the valve assembly of FIG. 3 takenalong the view line 6-6.

FIG. 7A is a front elevation view of an embodiment of a housingcompatible with the valve assembly of FIG. 3.

FIG. 7B is a cross-sectional view of the housing of FIG. 7A taken alongthe view line 7B-7B.

FIG. 7C is a cross-sectional view of the housing of FIG. 7A taken alongthe view line 7C-7C.

FIG. 8 is a top plan view of an embodiment of a cover compatible withthe valve assembly of FIG. 3.

FIG. 9 is a perspective view of an embodiment of a nozzle membercompatible with the valve assembly of FIG. 3.

FIG. 10 is a perspective view of an embodiment of a nozzle membercompatible with the valve assembly of FIG. 3.

FIG. 11A is a cross-sectional view the valve assembly of FIG. 3 takenalong the view line 11A-11A showing the valve assembly in a firstoperational configuration.

FIG. 11B is a cross-sectional view the valve assembly of FIG. 3 takenalong the view line 11B-11B showing the valve assembly in the firstoperational configuration.

FIG. 12A is a cross-sectional view the valve assembly of FIG. 3 similarto the view depicted in FIG. 11A showing the valve assembly in a secondoperational configuration.

FIG. 12B is a cross-sectional view the valve assembly of FIG. 3 similarto the view depicted in FIG. 11B showing the valve assembly in thesecond operational configuration.

FIG. 13A is a perspective view of the valve assembly of FIG. 3 coupledwith a fuel delivery line having an air intake.

FIG. 13B is a perspective view of the valve assembly of FIG. 3 coupledwith a fuel delivery line having a smaller air intake than that shown inFIG. 13A.

FIG. 14 is a perspective view of an embodiment of an oxygen depletionsensor compatible with the fuel delivery system of FIG. 2.

FIG. 15 is a perspective view of another embodiment of a valve assemblycompatible with, for example, certain embodiments of the heater 10.

FIG. 16 is an exploded perspective view of the valve assembly of FIG.15.

FIG. 17A is a front elevation view of an embodiment of a valve bodycompatible with the valve assembly of FIG. 15.

FIG. 17B is a cross-sectional view of the valve body of FIG. 17A takenalong the view line 17B-17B.

FIG. 17C is a cross-sectional view of the valve body of FIG. 17A takenalong the view line 17C-17C.

FIG. 17D is a cross-sectional view of the valve body of FIG. 17A takenalong the view line 17D-17D.

FIG. 18 is a bottom plan view of the valve assembly of FIG. 15.

FIG. 19 is a perspective view of an embodiment of a nozzle membercompatible with the valve assembly of FIG. 15.

FIG. 20 is a perspective view of an embodiment of a nozzle membercompatible with the valve assembly of FIG. 15.

FIG. 21 is a perspective view of the nozzle members of FIGS. 19 and 20in a coupled configuration.

FIG. 22A is a cross-sectional view of the valve assembly of FIG. 15taken along the view line 22A-22A showing the valve assembly in a firstoperational configuration.

FIG. 22B is a cross-sectional view of the valve assembly of Figuresimilar to the view depicted in FIG. 22A showing the valve assembly in asecond operational configuration.

FIG. 23A is a perspective view of the valve assembly coupled with a fueldelivery line showing the valve assembly in the first operationalconfiguration.

FIG. 23B is a perspective view of the valve assembly coupled with a fueldelivery line showing the valve assembly in the second operationalconfiguration.

FIG. 24 is a perspective view of another embodiment of a valve assemblycompatible with, for example, certain embodiments of the heater 10.

FIG. 25 is a partial cross-sectional view of a housing compatible withthe valve assembly of FIG. 24.

FIG. 26A is a front plan view of an embodiment of a valve bodycompatible with the valve assembly of FIG. 24.

FIG. 26B is a cross-sectional view of the valve body of FIG. 26A takenalong the view line 26B-26B.

FIG. 26C is a cross-sectional view of the valve body of FIG. 26A takenalong the view line 26C-26C.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Many varieties of space heaters, wall heaters, stoves, fireplaces,fireplace inserts, gas logs, and other heat-producing devices employcombustible fluid fuels, such as liquid propane and natural gas. Theterm “fluid,” as used herein, is a broad term used in its ordinarysense, and includes materials or substances capable of fluid flow, suchas, for example, one or more gases, one or more liquids, or anycombination thereof. Fluid-fueled units, such as those listed above,generally are designed to operate with a single fluid fuel type at aspecific pressure or within a range of pressures. For example, somefluid-fueled heaters that are configured to be installed on a wall or afloor operate with natural gas at a pressure in a range from about 3inches of water column to about 6 inches of water column, while othersare configured to operate with liquid propane at a pressure in a rangefrom about 8 inches of water column to about 12 inches of water column.Similarly, some gas fireplaces and gas logs are configured to operatewith natural gas at a first pressure, while others are configured tooperate with liquid propane at a second pressure that is different fromthe first pressure. As used herein, the terms “first” and “second” areused for convenience, and do not connote a hierarchical relationshipamong the items so identified, unless otherwise indicated.

In many instances, the operability of such fluid-fueled units with onlya single fuel source is disadvantageous for distributors, retailers,and/or consumers. For example, retail stores often try to predict thedemand for natural gas units versus liquid propane units over a givenperiod of time, and consequently stock their shelves and/or warehouseswith a percentage of each variety of unit. If such predictions proveincorrect, stores can be left with unsold units when the demand for onetype was less than expected. On the other hand, some potential customerscan be left waiting through shipping delays or even be turned awayempty-handed when the demand for one type of unit was greater thanexpected. Either case can result in financial and other costs to thestores. Additionally, consumers can be disappointed to discover that thestyles or models of heaters, fireplaces, stoves, or other fluid-fueledunits with which they wish to furnish their homes are incompatible withthe type of fuel with which their homes are serviced. This situation canresult in inconveniences and other costs to the consumers. Accordingly,fluid-fueled devices configured to operate with more than one fuelsource (e.g., with either a natural gas or a liquid propane fuel source)would be desirable, as such devices could alleviate and/or resolve atleast the foregoing problems.

In further instances, the appearance of a flame produced by certainembodiments of fluid-fueled units is important to the marketability ofthe units. For example, some gas fireplaces, gas logs, and fireplaceinserts are desirable as either replacements for or additions to naturalwood-burning fireplaces. Such replacement units can desirably exhibitenhanced efficiency, improved safety, and/or reduced mess. Furthermore,such heat-producing units can eliminate the need for venting systems,such as chimneys, which can be difficult to maintain, costly to install,or even infeasible in some cases. In many instances, a flame produced bysuch a replacement gas unit desirably resembles that produced by burningwood, and thus preferably has a substantially yellow hue.

Certain embodiments of fluid-fueled units can produce substantiallyyellow flames. The amount of oxygen present in the fuel at a combustionsite of a unit (e.g., at a burner) can affect the color of the flameproduced by the unit. Accordingly, in some embodiments, one or morecomponents the unit are adjusted to regulate the amount of air that ismixed with the fuel to create a proper air/fuel mixture at the burner.Such adjustments can be influenced by the pressure at which the fuel isdispensed.

A particular challenge in developing some embodiments of fluid-fueledunits that are operable with more than one fuel source (e.g., operablewith either a natural gas or a liquid propane fuel source) arises fromthe fact that different fuel sources are generally provided at differentpressures. Additionally, in many instances, different fuel types requiredifferent amounts of oxygen to create a substantially yellow flame.Certain advantageous embodiments disclosed herein provide structures andmethods for configuring a fluid-fueled device to produce a yellow flameusing any of a plurality of different fuel sources, and in furtherembodiments, for doing so with relative ease.

Certain embodiments disclosed herein reduce or eliminate one or more ofthe foregoing problems associated with fluid-fueled devices and/orprovide some or all of desirable features detailed above. Althoughvarious embodiments described hereafter are presented in the context ofvent-free devices, the apparatus and devices disclosed and enabledherein can benefit a wide variety of other applications, including, forexample, direct vent systems.

FIG. 1 illustrates one embodiment of a fireplace, heat-generating unit,or heating device 10 configured to operate with one or more sources ofcombustible fuel. In various embodiments, the heating device 10 isconfigured to be installed on or within a wall, within a fireplace, on afloor, or in a variety of other static positions. In other embodiments,the heating device 10 is can be positioned in a variety of locationsand/or is substantially portable.

In certain embodiments, the heating device 10 includes a housing 20. Thehousing 20 can include metal or some other suitable material forproviding structure to the heating device 10 without melting orotherwise deforming in a heated environment. The housing 20 can define awindow 22. In some embodiments, the window 22 defines a substantiallyopen area through which heated air and/or radiant energy can pass. Inother embodiments, the window 22 comprises a sheet of substantiallyclear material, such as tempered glass, that is substantially imperviousto heated air but substantially transmissive to radiant energy.

The heating device 10 can have one or more intake vents 24 through whichair can flow into the housing 20 and/or outlet vents 26 through whichheated air can flow out of the housing 20. In some embodiments, theheating device 10 includes a grill 28. The grill 28 can provide asurface against which artificial logs may rest, and can resemble similarstructures used in wood-burning fireplaces.

In certain embodiments, the heating device 10 includes a fuel deliverysystem 40, which can have portions for accepting fuel from a fuelsource, for directing flow of fuel within the heating device 10, and forcombusting fuel. In the embodiment illustrated in FIG. 1, portions of anembodiment of the fuel delivery system 40 that would be obscured by theheating device 10 are shown in phantom.

With reference to FIG. 2, in certain embodiments, the fuel deliverysystem 40 includes a regulator 120. The regulator 120 can be configuredto selectively receive either a first fluid fuel (e.g., natural gas)from a first source at a first pressure or a second fluid fuel (e.g.,liquid propane) from a second source at a second pressure. In certainembodiments, the regulator 120 includes a first input port 121 forreceiving the first fuel and a second input port 122 for receiving thesecond fuel. In some embodiments, the second input port 122 isconfigured to be plugged when the first input port 121 is coupled withthe first fuel source, and the first input port 121 is configured to beplugged when the second input port 122 is coupled with a second fuelsource.

The regulator 120 can define an output port 123 through which fuel exitsthe regulator 120. In certain embodiments, the regulator 120 isconfigured to regulate fuel entering the first port 121 such that fuelexiting the output port 123 is at a relatively steady first pressure,and is configured to regulate fuel entering the second port 122 suchthat fuel exiting the output port 123 is at a relatively steady secondpressure. Various embodiments of regulators 120 compatible with certainembodiments of the fuel delivery system 40 described herein aredisclosed in U.S. patent application Ser. No. 11/443,484, titledPRESSURE REGULATOR, filed May 30, 2006, the entire contents of which arehereby incorporated by reference herein and made a part of thisspecification.

In certain embodiments, the output port 123 of the regulator 120 iscoupled with a source line 125. The source line 125, and any other fluidline described herein, can comprise piping, tubing, conduit, or anyother suitable structure adapted to direct or channel fuel along a flowpath. In some embodiments, the source line 125 is coupled with theoutput port 123 at one end and is coupled with a control valve 130 atanother end. The source line 125 can thus provide fluid communicationbetween the regulator 120 and the control valve 130.

In certain embodiments, the control valve 130 is configured to regulatethe amount of fuel delivered to portions of the fuel delivery system 40.The control valve 130 can assume a variety of configurations, includingthose known in the art as well as those yet to be devised. The controlvalve 130 can comprise a first knob or dial 131 and a second dial 132.In some embodiments, the first dial 131 can be rotated to adjust theamount of fuel delivered to a burner 135, and the second dial 132 can berotated to adjust a setting of a thermostat. In other embodiments, thecontrol valve 130 comprises a single dial 131.

In many embodiments, the control valve 130 is coupled with a burnertransport line 137 and an oxygen depletion sensor (ODS) transport line138, each of which can be coupled with a valve assembly 140. In someembodiments, the valve assembly 140 is further coupled with a first ODSdelivery line 141, a second ODS delivery line 142, and a burner deliveryline 143. As described below, the valve assembly 140 can be configuredto direct fuel received from the ODS transport line 138 to either thefirst ODS delivery line 141 or the second ODS delivery line 142, and canbe configured to direct fuel received from the burner transport line 132along different flow paths toward the burner delivery line 143.

In certain embodiments, the first and second ODS delivery lines 141, 142are coupled with separate portions of an ODS 180. Fuel delivered to theODS 180 can be combusted to form a pilot flame, which can serve toignite fuel delivered to the burner 135 and/or serve as a safety controlfeedback mechanism that can cause the control valve 130 to shut offdelivery of fuel to the fuel delivery system 40. Additionally, in someembodiments, the ODS 180 is configured to provide power to thethermostat of the control valve 130. Accordingly, in some embodiments,the ODS 180 is coupled with the control valve 130 by one or more of afeedback line 182 and a power line 183.

In further embodiments, the ODS 180 comprises an electrode configured toignite fuel delivered to the ODS 180 via one or more of the ODS deliverylines 141, 142. Accordingly, the ODS 180 can be coupled with an igniterline 184, which can be connected to an igniter switch 186. In someembodiments, the igniter switch 186 is mounted to the control valve 130.In other embodiments, the igniter switch 186 is mounted to the housing20 of the heating device 10. Any of the lines 182, 183, 184 can compriseany suitable medium for communicating an electrical quantity, such as avoltage or an electrical current. For example, in some embodiments, oneor more of the lines 182, 183, 184 comprise a metal wire.

In certain embodiments, the burner delivery line 143 is situated toreceive fuel from the valve assembly 140, and can be connected theburner 135. The burner 135 can comprise any suitable burner, such as,for example, a ceramic tile burner or a blue flame burner, and ispreferably configured to continuously combust fuel delivered via theburner delivery line 143.

In certain embodiments, either a first or a second fuel is introducedinto the fuel delivery system 40 through the regulator 120. In someembodiments, the first or the second fuel proceeds from the regulator120 through the source line 125 to the control valve 130. In someembodiments, the control valve 130 can permit a portion of the first orthe second fuel to flow into the burner transport line 132, and canpermit another portion of the first or the second fuel to flow into theODS transport line 134.

In some embodiments, the first or the second fuel can proceed to thevalve assembly 140. In many embodiments, the valve assembly 140 isconfigured to operate in either a first state or a second state. In someembodiments, the valve assembly 140 directs fuel from the burnertransport line 132 along a first flow path into the burner delivery line143 and directs fuel from the ODS transport line 138 to the first ODSdelivery line 141 when the valve assembly 140 is in the first state. Infurther embodiments, the valve assembly 140 is configured to channelfuel from the burner transport line 132 along a second flow path intothe burner delivery line 143 and from the ODS transport line 138 to thesecond ODS delivery line 142 when the valve assembly 140 is in thesecond state.

In some embodiments, when the valve assembly 140 is in the first state,fuel flows through the first ODS delivery line 141 to the ODS 180, whereit is combusted. When the valve assembly 140 is in the second state,fuel flows through the second ODS delivery line 142 to the ODS 180,where it is combusted. In some embodiments, when the valve assembly 140is in either the first or second state, fuel flows through the burnerdelivery line 143 to the burner 190, where it is combusted.

With reference to FIG. 3, in certain embodiments, the valve assembly 140includes a housing 210. The housing 210 can comprise a unitary piece ofmaterial, or can comprise a multiple pieces joined in any suitablemanner. In certain embodiments, the housing 210 defines one or moreinlets, inputs, receiving ports, outlets, outputs, delivery ports, flowpaths, pathways, or passageways through which fuel can enter, flowthrough, and/or exit the valve assembly 140. In some embodiments, thehousing 210 defines an ODS input 220 configured to couple with the ODStransport line 138 and to receive fuel therefrom. The housing 210 candefine a first ODS output 222 configured to couple with first ODSdelivery line 141 and to deliver fuel thereto, and can define a secondODS output 224 configured to couple with the second ODS delivery line142 and to deliver fuel thereto.

Each of the ODS input 220 and the first and second ODS outputs 222, 224can define a substantially cylindrical protrusion, and can includethreading or some other suitable connection interface. In someembodiments, the ODS input 220 and the first and second ODS outputs 222,224 are substantially coplanar. The first ODS output 222 can define afirst longitudinal axis that is substantially collinear with a secondlongitudinal axis defined by the second ODS output 224, and in someembodiments, the ODS input 220 defines a longitudinal axis thatintersects a line through the first and second longitudinal axes at anangle. In some embodiments, the angle is about 90 degrees. Otherconfigurations of the ODS input 220 and outputs 222, 224 are possible.

In some embodiments, the housing 210 defines a burner input 230configured to couple with the burner transport line 137 and to receivefuel therefrom. In some embodiments, the burner input 230 defines asubstantially cylindrical protrusion, which can include threading or anyother suitable connection interface. In some embodiments, the burnerinput 230 is larger than the ODS input 220, and can thus be configuredto receive relatively more fuel. In some embodiments, the burner input230 defines a longitudinal axis that is substantially parallel to alongitudinal axis defined by ODS input 220. Other configurations of theburner input 230 are also possible.

With reference to FIG. 4, in certain embodiments, the housing 210defines a chamber 240. In some embodiments, each of the burner input230, the ODS input 220, and the ODS outputs 222, 224 defines apassageway leading into the chamber 240 such that the chamber 240 can bein fluid communication with any of the inputs 220, 230 and outputs 222,224. In some embodiments, chamber 240 is defined by a substantiallysmooth inner sidewall 242 of the housing 210. The inner sidewall 242 candefine any suitable shape, and in some embodiments, is rotationallysymmetric. In various embodiments, the inner sidewall is substantiallyfrustoconical or substantially cylindrical. The chamber 240 can thus besized and shaped to receive a valve member, core, fluid flow controller,or valve body 250.

In some embodiments, the valve body 250 includes a lower portion 252that defines an outer surface which is substantially complementary tothe inner sidewall 242 of the housing 210. Accordingly, in someembodiments, the valve body 250 can form a substantially fluid-tightseal with the housing 210 when seated therein. In some embodiments, thevalve body 250 is configured to rotate within the chamber 240. Asuitable lubricant is preferably included between the valve body 250 andthe inner sidewall 242 of the housing 210 in order to permit relativelysmooth movement of the valve body 250 relative to the housing 210. Thevalve body 250 can define a channel 260 configured to direct fuel fromthe ODS input 220 to either the first or second ODS output 222, 224, andcan include a series of apertures, openings, or ports 262 configured todirect fuel from the burner input 230 along either of two separate flowpaths toward the burner delivery line 143, as further described below.

In some embodiments, the valve body 250 includes an upper portion 270,which can be substantially collar-shaped, and which can include achamfered upper surface. In some embodiments, the upper portion 270defines a longitudinal slot 272 and/or can define at least a portion ofan upper cavity 274.

In some embodiments, a biasing member 280 is configured to be receivedby the upper cavity 274 defined by the valve body 250. The biasingmember 280 can comprise, for example, a spring or any other suitableresilient element. In some embodiments, the biasing member 280 defines asubstantially frustoconical shape and can be oriented such that arelatively larger base thereof is nearer the lower portion of the valvebody 250 than is a smaller top thereof. References to spatialrelationships, such as upper, lower, top, etc., are made herein merelyfor convenience in describing embodiments depicted in the figures, andshould not be construed as limiting. For example, such references arenot intended to denote a preferred gravitational orientation of thevalve assembly 140.

In some embodiments, an actuator, rod, column, or shaft 290 isconfigured to be received by the upper cavity 274 defined by the valvebody 250. In some embodiments, the biasing member 280 is retainedbetween a ledge defined by the valve body 250 (shown in FIG. 5B) and theshaft 290, thus providing a bias that urges the shaft 290 upward, oraway from the valve body 290, in the assembled valve assembly 140. Incertain embodiments, the shaft 290 defines a protrusion 292 sized andshaped be received by the slot 272 defined by the valve body 250. Insome embodiments, the protrusion 292 is sized to fit within the slot 272with relatively little clearance or, in other embodiments, snugly, suchthat an amount of rotational movement by the protrusion 292 closelycorrelates with an amount of rotation of the valve body 250. In someembodiments, the protrusion 292 is substantially block-shaped, andprojects at a substantially orthogonally with respect to a longitudinallength of a substantially columnar body of the shaft 290. In someembodiments, the protrusion 292 is capable of longitudinal movementwithin the slot 272, and can be capable of rotating the valve body 250at any point within the range of longitudinal movement.

In some embodiments, the shaft 290 defines a channel 294 sized andshaped to receive a split washer 296. The shaft 290 can define anextension 298. In some embodiments, the extension 298 defines twosubstantially flat and substantially parallel sides configured to beengaged by a clamping device, such as a pair of pliers, such that theshaft 290 can be rotated. In other embodiments, the extension 298 isconfigured to couple with a knob or some other suitable grippabledevice, and in some embodiments, defines only one flat surface. Otherconfigurations of the shaft 290 are also possible.

In some embodiments, the shaft 290 extends through a cap 300 in theassembled valve assembly 140. The cap 300 can define an opening 302sized and shaped to receive the shaft 290 and to permit rotationalmovement of the shaft 290 therein. In some embodiments, the split washer296 prevents the shaft 290 from being forced downward and completelythrough the opening 302 in the assembled valve assembly 140.

The cap 300 can include a neck 304, which can be threaded to engage acollar or cover. In some embodiments, the cap 300 defines a flange 306through which fasteners 308, such as, for example, screws, can beinserted to connect the cap 300 with the housing 210.

In some embodiments, the housing 210 defines an opening 310, which insome embodiments, results from the drilling or boring of a flow channelwithin the housing 210, as described below. In some embodiments, theopening 310 is sealed with a plug 312, which in some embodiments,includes a threaded portion configured to interface with an innersurface of the housing 210 that defines the flow channel. In someembodiments, glue, epoxy, or some other suitable bonding agent isincluded between the plug 312 and the housing 210 in order to ensurethat a substantially fluid-tight seal is created.

In certain embodiments, the housing 210 is configured to be coupled witha nozzle element, fuel director, fuel dispenser, or first nozzle member320, a second nozzle member 322, and/or a cover 324, as furtherdescribed below. In some embodiments, the cover 324 defines a flange 326through which fasteners 328, such as, for example, screws, can beinserted to connect the cover 324 with the housing 210. In furtherembodiments, a sealing member or gasket 332 is coupled with the housing210 in order to create a substantially fluid-tight seal, as furtherdescribed below.

With reference to FIGS. 5A-5D, in certain embodiments, the valve body250 defines three burner ports 262 a, b, c configured to permit thepassage of fuel. In some embodiments, the ports 262 a, b, c are formedby drilling or boring two flow channels into a solid portion of thevalve body 250. In some embodiments, one of the flow channels extendsfrom one side of the valve body 250 to an opposite side thereof, and theother flow channel extends from another side of the valve body 250 andintersects the first flow channel within the valve body 250. In someembodiments, the ports 262 a, b, c are substantially coplanar, and infurther embodiments, are coplanar along a plane that is substantiallyorthogonal to a longitudinal axis of the valve body 250.

In some embodiments, the valve body 250 is substantially hollow, and candefine a lower cavity 340 which can reduce the material costs ofproducing the valve body 250. The lower cavity 340 can have a perimeter(e.g. circumference) smaller than a perimeter of the upper cavity 274.Accordingly, in some embodiments, the valve body 250 defines a ledge 342against which the biasing member 280 can rest.

As described above, the valve body 250 can define a groove or a channel260 configured to direct fuel flow. In some embodiments, the channel 260is milled or otherwise machined into a side of the valve body 250. Insome embodiments, a first end of the channel 260 is substantiallyaligned with the port 262 a along a plane through a first longitudinalaxis of the valve body 250, and a second end of the channel 260 issubstantially aligned with the port 263 b along a second plane through alongitudinal axis of the valve body 250. In some embodiments, the firstplane and the second plane are substantially orthogonal to each other.

In other embodiments, the valve body 250 does not include a lower cavity340 such that the valve body 250 is substantially solid. Ports similarto the ports 262 a, b, c can thus be created in the valve body 250 inplace of the channel 260. Other configurations of the valve body 250 arealso possible.

With reference to FIG. 6, in certain embodiments, the cap 300 defines achannel, slot, or first depression 350 and a second depression 352. Insome embodiments, the first and second depressions 350, 352 are sizedand shaped to receive a portion of the protrusion 292 defined by theshaft 290. The first and second depressions 350, 352 can define an anglerelative to a center of the cap 300. In preferred embodiments, the angleis about 90 degrees. Other angles are also possible, including, forexample, between about 30 degrees and about 270 degrees, between about45 and about 180 degrees, and between about 60 and about 120 degrees; noless than about 30 degrees, about 45 degrees, about 60 degrees, andabout 90 degrees; and no greater than about 270 degrees, about 180degrees, about 120 degrees, and about 90 degrees. The first and seconddepressions 350, 352 can be separated by a relatively short shelf orledge 354. In some embodiments, the first and second depressions 350,352 are also separated by a stop 356, which can be defined by anextension of the cap 300.

In some embodiments, the shaft 290 defines a receptacle 360 configuredto receive a portion of the biasing member 280. In some embodiments, thereceptacle 360 contacts the top end of the biasing member 280, and thebiasing member 280 urges the shaft 290 upward toward the cap 300.Accordingly, in some embodiments, the protrusion 292 of the shaft 290 isnaturally retained within one of the depressions 350, 352 by the biasprovided by the biasing member 280, and the shaft 290 is displaceddownward or depressed in order to rotate the shaft 290 such that theprotrusion 292 moves to the other depression 350, 352. Movement pasteither of the depressions 350, 352 can be prevented by the stop 356. Asnoted above, in many embodiments, movement of the protrusion 292 canresult in correlated movement of the valve body 250. Accordingly,rotation of the shaft 290 between the first and second depressions 350,352 can rotate the valve body 250 between a first and a secondoperational state, as described further below.

FIGS. 7A-7C illustrate an embodiment of the housing 210. With referenceto FIGS. 7A and 7B, in certain embodiments, the ODS input 220 defines atleast a portion of a channel, conduit, passageway, or flow path 370along which fuel can flow toward the chamber 240. The ODS output 222 candefine at least a portion of a flow path 372, and the ODS output 224 candefine at least a portion of a flow path 374, along which fuel can flowaway from the chamber 240 and out of the housing 210. In someembodiments, the flow paths 372, 374 define longitudinal axes that aresubstantially collinear. In some embodiments, a longitudinal axis of theflow path 370 is substantially orthogonal to one or more of the flowpaths 372, 374. Other arrangements are also possible.

With reference to FIGS. 7A and 7C, in some embodiments, the burner input230 of the housing 210 defines at least a portion of a flow path 380along which fuel can flow toward the chamber 240. The housing 210 candefine a first egress flow path 382 along which fuel can flow away fromthe chamber 240 and out of the housing 240. In some embodiments, aninner surface of the portion of the housing 210 that defines the egressflow path 382 can be threaded or include any other suitable connectioninterface for coupling with the first nozzle member 320, as furtherdescribed below. The housing 210 can define a second egress flow path384 along which fuel can flow away from the chamber 240 and out of thehousing 240. In certain embodiments, the housing 210 defines anindentation, cavity, or recess 388. In some embodiments, the recess 388defines a portion of the second egress flow path 384.

In some embodiments, the recess 388 is defined by a projection 390 ofthe housing 210. The projection 390 can further define a channel 392 forreceiving the gasket 332 to thereby form a substantially fluid-tightseal with the cover 324. In some embodiments, a face 394 of theprojection 390 is substantially flat, and can be configured to abut thecover 324. The face 394 can define apertures through which fasteners canbe advanced for coupling the cover 324 with the housing 210. In someembodiments, the face 394 defines a plane that is substantially parallelto a longitudinal axis defined by the inner sidewall 242 of the housing210.

With reference to FIG. 8, in certain embodiments, the cover 324 is sizedand shaped such that a periphery thereof substantially conforms to aperiphery of the face 394 of the housing 210. Accordingly, an edgearound the cover 324 and the face 394 can be substantially smooth whenthe cover 324 is coupled with the housing 210. In some embodiments, anunderside of the cover 324 is substantially flat (see FIG. 4), and canthus be in relatively close proximity to the flat face 394 of thehousing when coupled therewith. In some embodiments, the cover 324defines a collar 400 configured to receive a portion of the secondnozzle member 322. The collar 400 can include threading or any othersuitable connection interface, which can be disposed along an interiorsurface thereof.

With reference to FIG. 9, in certain embodiments, the second nozzlemember 322 can include a rim 410 configured to couple with the collar400 of the cover 324. In some embodiments, the rim 410 defines an inlet411 of the second nozzle member 322 through which fuel can be acceptedinto the nozzle member 322. The rim 410 can comprise threading or anyother suitable connection interface along an interior or exteriorsurface thereof. The rim 410 can define at least a portion of a cavity412, which in some embodiments, is sufficiently large to receive atleast a portion of the first nozzle member 320. In some embodiments, thecavity 412 extends through the full length of the second nozzle member322, and can define an outlet 414 (see also FIG. 11A) at an end oppositethe rim 410. In some embodiments, the second nozzle member 322 defines atightening interface 416 configured to be engaged by a tightening devicein order to securely couple the second nozzle member 322 with the cover324.

With reference to FIG. 10, in certain embodiments, the first nozzlemember 320 can comprise a distal portion 420, which can be configured tocouple with the housing 210. The distal portion 420 can define an inlet421 of the first nozzle member 320 configured to receive fuel into thefirst nozzle member 320. In some embodiments, an outer surface of thedistal portion 420 is threaded, and is capable of engaging an innersurface of the housing 210 that at least partially defines the firstegress flow path 382. The first nozzle member 320 can define atightening interface 422 configured to be engaged by a tightening devicein order to securely couple the first nozzle member 320 with the housing210. The tightening interface 422 can comprise a substantially hexagonalflange, which can be engaged by a wrench or other suitable tighteningdevice. In some embodiments, the first nozzle member 320 defines anoutlet 423, which can be substantially opposite the distal portion 420.

With reference to FIG. 11A, in certain embodiments, a substantialportion of the first nozzle member 320 is within the second nozzlemember 322 in the assembled valve assembly 140. In some embodiments, thefirst nozzle member 320 and the second nozzle member 322 each comprise acommon longitudinal axis. In further embodiments, the longitudinal axisdefined by the first and second nozzle members 320, 233 is substantiallyperpendicular to a longitudinal axis defined by the inner sidewall 242of the housing 210. In some embodiments, one or more of the first andsecond nozzle members 320, 322 defines a longitudinal axis that issubstantially perpendicular to an axis about which the valve body 250 isconfigured to rotate.

The outlet 423 of the first nozzle member 320 can extend beyond, besubstantially flush with, or be interior to the outlet 414 of the secondnozzle member 322. Accordingly, in some embodiments, the first nozzlemember 320 is configured to direct fuel through the outlet 414 of thesecond nozzle member 320. Various embodiments of first and second nozzlemembers compatible with certain embodiments of the valve assembly 140described herein are disclosed in U.S. patent application Ser. No.11/443,446, titled NOZZLE, filed May 30, 2006, the entire contents ofwhich are hereby incorporated by reference herein and made a part ofthis specification.

In some embodiments, the distal portion 420 of the first nozzle member320 is coupled with the housing 210 in substantially fluid-tightengagement. The first nozzle member 320 can thus define an inner flowchannel 424 through which fuel can be directed and dispensed. In someembodiments, fuel is dispensed from the inner flow channel 424 via theoutlet 423 at a first pressure.

In some embodiments, the rim 410 of the second nozzle member 322 iscoupled with the collar 400 of the cover 324 in substantiallyfluid-tight engagement, and can provide an outer flow channel 426through which fuel can be directed and dispensed. In some embodiments,at least a portion of an outer boundary of the outer flow channel 426 isdefined by an inner surface of the second nozzle member 322, and atleast a portion of an inner boundary of the outer flow channel 426 isdefined by an outer surface of the first nozzle member 320. Thus, insome embodiments, at least a portion of the inner flow channel 424 iswithin the outer flow channel 426. In some embodiments, fuel isdispensed from the outer flow channel 426 via the outlet 414 at a secondpressure. In some embodiments, the second pressure is less than thefirst pressure at which fuel is dispensed from the inner flow channel424. In further embodiments, the inner flow 424 channel is configured todispense liquid propane at the first pressure and the outer flow channel426 is configured to dispense natural gas at a second pressure.

Other configurations of the nozzle members 320, 322 and/or the inner andouter flow channels 424, 426 are also possible. For example, in someembodiments the first nozzle member 320 is not located within the secondnozzle member 322. The first and second nozzle members 320, 322 can besituated proximate or adjacent one another, can be oriented to dispensefuel in a substantially common direction, or can be oriented to dispensefuel in different directions, for example.

With continued reference to FIG. 11A, the illustrated embodiment of thevalve assembly 140 is shown in a first operational configuration. In thefirst configuration, the valve body 250 is oriented in a first positionsuch that the ports 262 a, 262 c provide fluid communication between theflow path 380 defined by the input 230 and the first egress flow path382 defined by the housing 210. In some embodiments, the port 262 b isdirected toward the inner sidewall 242 of the housing 210, which cansubstantially prevent fluid flow out of the port 262 b. Additionally,the valve body 250 can substantially block the second egress flow path384, thereby substantially preventing fluid flow through the secondegress flow path 384.

Accordingly, in certain embodiments, in the first operationalconfiguration, the valve assembly 140 can accept fuel via the burnerinput 230, can direct the fuel along the flow path 380, through thevalve body 250, through the first egress flow path 382 and through theinner flow channel 424, and can dispense the fuel at a proximal end ofthe inner flow channel 424 via the outlet 423.

With reference to FIG. 11B, in certain embodiments, when the valve body250 is oriented in the first position, the channel 260 can provide fluidcommunication between the flow path 370 and the flow path 372 defined bythe housing 210. Accordingly, fuel entering the ODS input 220 can flowthrough the flow path 370, through the channel 260, through the flowpath 372, and out of the first ODS output 222. In some embodiments, thevalve body 250 can substantially block the flow path 374 such that fuelis substantially prevented from flowing through the second ODS output224.

With reference to FIG. 12A, the illustrated embodiment of the valveassembly 140 is shown in a second operational configuration. In thesecond configuration, the valve body 250 is oriented in a secondposition such that the ports 262 a, 262 b provide fluid communicationbetween the flow path 380 defined by the input 230 and the second egressflow path 384 defined by the housing 210. In some embodiments, the port262 c is directed toward the inner sidewall 242 of the housing 210,which can substantially prevent fluid flow out of the port 262 c.Additionally, the valve body 250 can substantially block the firstegress flow path 382, thereby substantially preventing fluid flowthrough the second egress flow path 382.

Accordingly, in certain embodiments, in the second operationalconfiguration, the valve assembly 140 can accept fuel via the burnerinput 230, can direct the fuel along the flow path 380, through thevalve body 250, through the second egress flow path 384 and through theouter flow channel 426, and can dispense the fuel at a proximal end ofthe outer flow channel 426 via the outlet 414.

With reference to FIG. 12B, in certain embodiments, when the valve body250 is oriented in the second position, the channel 260 can providefluid communication between the flow path 370 and the flow path 374defined by the housing 210. Accordingly, fuel entering the ODS input 220can flow through the flow path 370, through the channel 260, through theflow path 374, and out of the second ODS output 224. In someembodiments, the valve body 250 can substantially block the flow path372 such that fuel is substantially prevented from flowing through thesecond ODS output 224.

In certain embodiments, the valve assembly 140 is configured to acceptand channel liquid propane when in the first operational configurationand to accept and channel natural gas when in the second operationalconfiguration. In other embodiments, the valve assembly 140 isconfigured to channel one or more different fuels when in either thefirst or second operational configuration.

With reference to FIG. 13A, in certain embodiments, the valve assembly140 is positioned to be in fluid communication with the burner deliveryline 143. The valve assembly 140 can be coupled with the burner deliveryline 143 in any suitable manner and/or can be positioned in relativelyfixed relation with respect to the burner delivery line 143. In someembodiments, the burner delivery line defines an opening (not shown) ata first end thereof through which one or more of the nozzle elements320, 322 can extend. In other embodiments, the nozzle elements 320, 322are not located within the burner delivery line 143 but are positionedto direct fuel into the burner delivery line 143. The burner deliveryline 143 can define an opening 440 at a second end thereof through whichfuel can flow to the burner 135.

In some embodiments, the burner delivery line 143 defines an air intake,aperture, opening, or window 445 through which air can flow to mix withfuel dispensed by the valve assembly 140. In some embodiments, thewindow 445 is adjustably sized. For example, in some embodiments, theburner delivery line 143 defines a mixing section, passageway, chamber,corridor, or compartment 446, which can include a primary conduit 447and a sleeve 449. As used herein, the term “compartment” is a broad termused in its ordinary sense and can include, without limitation,structures that define a volume of space through which fluid can flow.

Each of the primary conduit 447 and the sleeve 449 can define anopening. In some embodiments, the openings can be relatively alignedwith each other such that the window 445 is relatively large, and thesleeve 449 can be rotated such that less of the openings are aligned,thereby making the window 445 relatively smaller. In some embodiments, awrench or other suitable device is used to adjust the size of the window445. In other embodiments, the size of the window 445 can be adjusted byhand.

With continued reference to FIG. 13A, in some embodiments, the window445 is relatively large, thus allowing a relatively large amount of airto be drawn into the burner delivery line 143 as fuel is dispensed fromthe valve assembly 140. In some embodiments, the valve assembly 140 isconfigured to operate in the first configuration such that fuel isdispensed via the outlet 423 defined by the first nozzle member 320 whenthe window 445 is relatively large.

With reference to FIG. 13B, in some embodiments, the window 445 isrelatively small, thus allowing a relatively small amount of air to bedrawn into the burner delivery line 143 as fuel is dispensed from thevalve assembly 140. In some embodiments, the valve assembly 140 isconfigured to operate in the second configuration such that fuel isdispensed via the outlet 414 defined by the second nozzle member 322when the window 445 is relatively small.

In certain embodiments, the valve assembly 140 and the window 445 areconfigured to create an air-fuel mixture that produces a blue flame atthe burner 135. In further embodiments one or more of the valve assembly140 and the window 445 can be adjusted to alter the air-fuel mixture,and as a result, certain properties of the flame produced at the burner.Such properties can include, for example, the color, shape, height,and/or burn quality (e.g., number and/or type of by-products) of theflame.

With reference to FIG. 14, in certain embodiments, the ODS 180 includesnozzle body or first fuel dispenser 460 coupled with the first ODSdelivery line 141 and a second fuel dispenser 462 coupled with thesecond ODS delivery line 142. The ODS 180 can include a thermocouple 462coupled with the feedback line 182, a thermopile 464 coupled with thepower line 183, and an igniter 466 coupled with the igniter line 184.

In some embodiments, the first dispenser 460 includes a plurality ofnozzles 470 configured to direct a flame toward the thermocouple 462,the thermopile 464, and/or the burner 135 when the valve assembly 140 isin the first state. The second dispenser 462 can include a plurality ofnozzles 472 configured to direct a flame toward the thermocouple 462,the thermopile 464, and/or the burner 135 when the valve assembly 140 isin the second state.

In some embodiments, heating the thermocouple 462 provides current to asolenoid within the control valve 130, which maintains a shutoff valvein an open configuration and thus permits delivery of fuel to the burner135. Heating the thermopile 464 can provide electrical power to thecontrol valve 130 and/or an electrical component coupled with thecontrol valve 130, such as a thermostat. Other oxygen depletion sensorscompatible with certain embodiments described herein are disclosed inU.S. patent application Ser. No. 11/443,492, titled OXYGEN DEPLETIONSENSOR, filed May 30, 2006, the entire contents of which are herebyincorporated by reference herein and made a part of this specification.

FIG. 15 illustrates an embodiment of a valve assembly 500, which canresemble the valve assembly 140 in many respects. Accordingly, likefeatures are identified with like reference numerals. The valve assembly500 can also include features different from those discussed withrespect to the valve assembly 140, such as those described hereafter. Invarious embodiments, the valve assembly 500 is configured for use withthe heater 10, and can be configured for use with other suitable heatingdevices. In certain preferred embodiments, the valve assembly 500 isconfigured for use with gas log inserts, gas fireplaces, or otherheating devices for which the color of the flame produced by the devicesmay desirably be a preferred color, such as, for example, yellow.

In certain embodiments, the valve assembly 500 includes a housing 510.The housing 510 can comprise a unitary piece of material, or cancomprise multiple pieces joined in any suitable manner. In certainembodiments, the housing 510 defines an ODS input 220 configured tocouple with the ODS transport line 138 and to receive fuel therefrom.The housing 510 can define a first ODS output 222 configured to couplewith first ODS delivery line 141 and to deliver fuel thereto, and candefine a second ODS output 224 configured to couple with the second ODSdelivery line 142 and to deliver fuel thereto. In some embodiments, thehousing 510 defines a burner input 230 configured to couple with theburner transport line 137 and to receive fuel therefrom.

With reference to FIG. 16, in certain embodiments, the housing 510defines a cavity 274 configured to receive a valve body 550. The housing510 and/or the valve body 550 can be coupled with a biasing member 280,a shaft 290, and a cap 300 via one or more fasteners 308 and a splitwasher 296, as described above. In some embodiments, the housing 510 iscoupled with a plug 312.

The valve body 550 can resemble the valve body 250 in certain respectsand/or can include different features. In some embodiments, the valvebody 550 defines an upper set of apertures 555 and a lower set ofapertures 560, which are described more fully below. In someembodiments, the valve body 550 defines a protrusion 570 that can extendfrom a lower end of the valve body 550. The protrusion 570 can define asubstantially flat face 572 and a channel 574. In certain embodiments,the protrusion 570 extends through a lower end of the housing 510 in theassembled valve assembly 500.

In some embodiments, the valve assembly 500 includes a cam 580configured to couple with the protrusion 570 of the valve body 550. Thecam 580 can define an aperture 582 through which a portion of theprotrusion 570 can extend. In some embodiments, the aperture 582 issized such that the protrusion 570 fits snugly therein. In someembodiments, the aperture 582 is shaped substantially as a semicircle,and can comprise a flat face which, in further embodiments, extendsthrough an axial or rotational center of the cam 580. The flat face ofthe aperture 582 can abut the flat face 572 of the protrusion 570, andcan cause the cam 580 to rotate about the axial center when the valvebody 550 is rotated within the housing 510. In certain embodiments, thecam 580 is retained on the protrusion 570 via a split washer 584. Insome embodiments, a rod 586 extends from a lower surface of the cam 580.The rod 586 can be substantially cylindrical, thus comprising asubstantially smooth and rotationally symmetric outer surface.

In some embodiments, the housing 510 defines a projection 590 at a lowerend thereof. The projection 590 can be configured to couple with agasket 592, an 0-ring or sealing member 594, a first nozzle member 600and a cover 605, as further described below. In some embodiments, thecover 605 is coupled with the projection 590 via fasteners 608.

As with the cover 324, the cover 605 can define a substantially flatsurface 610 configured to abut a flat surface defined by the projection590, and in some embodiments, the cover 605 defines a collar 400. Thecover 605 can also define a rounded side surface 612. A radius of theside surface 612 can be slightly larger than the radius of a roundedportion of the cam 580, and can thus permit the rounded portion of thecam 580 to rotate proximate the cover 605 in the assembled valveassembly 500.

In certain embodiments, the cover 324 is configured to be coupled with ashroud, sleeve, occlusion member, or cover 620 and a second nozzlemember 625. In some embodiments, the cover 620 is substantiallycylindrical. An upper surface of the cover 620 can be substantiallyflat, and can define an opening 630. The opening 630 can be sized toreceive a rim 632 of the second nozzle member 625. The opening 630 canbe substantially circular, and can define a diameter slightly largerthan an outer diameter of the rim 632 of the second nozzle member 625.Accordingly, in some embodiments, the cover 620 can rotate about the rim632 of the second nozzle member 625 with relative ease in the assembledvalve assembly 500.

The cover 620 can define one or more screens 634 separated by one ormore gaps 636. In some embodiments, each screen 634 extends about agreater portion of a circumference of the cover 620 than does one ormore neighboring gaps. In some embodiments, each screen 634 issubstantially the same size and shape, and is spaced adjacent screens634 by an equal amount. Other arrangements are also possible.

The cover 620 can define an extension 640 that projects from a top endof the cover 620. In some embodiments, the extension 640 issubstantially coplanar with a top surface of the cover 620, and in otherembodiments, a plane defined by the extension 640 is substantiallyparallel to the plane of the top surface. In some embodiments, theextension 640 defines a slot 642 configured to receive the rod 586 ofthe cam 580. As further discussed below, the cam 580 can cooperate withthe extension 640 to rotate the cover 620 as the valve body 550 isrotated.

In some embodiments, the cover 620 is configured to receive a fueldirecting member, tube, pipe, or conduit 650, which in some embodiments,comprises or is coupled with the burner delivery line 143. In otherembodiments, the cover 620 is received within the conduit 650. In someembodiments, the cover 620 and conduit 650 cooperate to form a mixingsection, passageway, chamber, corridor, or compartment 660. As furtherdescribed below, the mixing compartment 660 can define one or moreadjustably sized air intakes, channels, openings, apertures, or windows665 through which air can flow to mix with fuel delivered to the conduit650 via the valve assembly 500. For example, a flow area of the windows665 can vary between a first operational configuration and a secondoperational configuration of the valve assembly 500.

With reference to FIGS. 17A-17D, in certain embodiments, the valvemember 550 defines a series of upper apertures 555 a, b and a series oflower apertures 560 a, b, c. Each of the apertures 555 a, b and 560 a,b, c can be in fluid communication with a cavity 670 defined by thevalve body 550. In some embodiments, the valve body 550 includes a cap675 configured to seal the cavity 670. Accordingly, in some embodiments,fuel can enter the cavity 670 via one or more of the apertures 555 a, band 560 a, b, c, can substantially fill the cavity 670, and can exit thecavity 670 via one or more of the apertures 555 a, b and 560 a, b, c,depending on the orientation of the valve body 550. In otherconfigurations, a separator, such as a plate or an insert, is positionedbetween the upper and lower apertures 555 a, b, 560 a, b, c,substantially preventing fluid communication between the upper and lowerapertures. Such configurations can be desirable for applications inwhich fuel entering the upper apertures 555 a, b is preferablymaintained separate from fuel entering the lower apertures 560 a, b, c.Any suitable combination of the features of the valve member 250 and thevalve member 550 is possible.

With reference to FIG. 18, in certain embodiments, the housing 510defines an opening 680 through which the protrusion 570 of the valvebody 550 can extend. The housing can define a recess 688, such as therecess 388. The recess 688 can cooperate with the cover 605 to define apassage through which fuel can flow. In some embodiments, the housing510 defines a channel 692, such as the channel 392, which can beconfigured to receive the gasket 592 in order to create a substantiallyfluid-tight seal between the housing 510 and the cover 605. In someembodiments, fuel can flow from a first egress aperture 694 defined bythe housing 510 and into the passage defined by the recess 688 and thecover 605 when the valve assembly 500 is in a first operationalconfiguration, as further described below.

In some embodiments, the housing 510 defines a second egress aperture700. As further described below, in some embodiments, fuel can flow fromthe second egress aperture 700 into the first nozzle member 600 when thevalve assembly 500 is in a second operational configuration. In someembodiments, the housing 510 defines a recess about the second egressaperture 700 which can be sized and shaped to receive the sealing member594, and can be configured to form a substantially fluid-tight sealtherewith.

With reference to FIG. 19, in certain embodiments, the first nozzlemember 600 includes an upper stem 710, a lower stem 712, and a body 714.In some embodiments, the upper stem 710 is substantially cylindrical.The upper stem can define an input 715 configured to receive fuel intothe first nozzle member 600, and can include shelf 716 configured tocontact the sealing member 594 in the assembled valve assembly 500. Thelower stem 712 can also be substantially cylindrical, and can define anouter diameter smaller than an outer diameter of the upper stem 710. Thelower stem 712 can define an output 717 configured to dispense fuel. Insome embodiments, an inner diameter defined by the lower stem 712 issmaller than an inner diameter defined by the upper stem 710.

In some embodiments, the body 714 includes two substantially flat faces718, which can be oriented substantially parallel to each other. Thefaces 718 can extend outward from the upper and lower stems 710, 712,and can thus define wings. In some embodiments, the nozzle member 600includes one or more connection interfaces 719 configured to engage thesecond nozzle member 600. In some embodiments, the connection interfaces719 comprise curved, threaded surfaces that extend from one face 718 toanother.

The first nozzle member 600 can define an inner flow path 720 thatextends through the upper and lower stems 710, 712 and the body 714. Insome embodiments, fuel can flow through the inner flow path 720 when thevalve assembly 500 is in the second operational configuration.

With reference to FIG. 20, in certain embodiments, an inner surface 730of the second nozzle member 625 is threaded or includes any othersuitable connection interface for coupling with the connection interfaceor interfaces 719 of the first nozzle member 600. In some embodiments,the threading extends through a substantial portion of the nozzle member625, and extends downward to an inwardly projecting ridge or shelf thatcan serve as a stop against which a lower edge of the body 714 of thefirst nozzle member 600 can abut. The second nozzle member 625 candefine an input 732 configured to receive fuel, and an output 734configured to dispense fuel.

With reference to FIG. 21, in certain embodiments, the first and secondnozzle members 600, 625 define a gap 740 through which fuel can flow. Insome embodiments, fuel can flow through the gap 740 and through an outerflow path 742, which can be defined by an outer surface of the firstnozzle member 600 and an inner surface of the second nozzle member 625.In some embodiments, fuel flows through the gap 740 and the outer flowpath 742 when the valve assembly 500 is in the first operationalconfiguration.

FIG. 22A illustrates an embodiment of the valve assembly 500 comprisinga housing 510 that defines an input flow path 750, a first egress flowpath 752, and a second egress flow path 754. In the illustratedembodiment, the valve assembly is in the first operationalconfiguration. In the first configuration, the valve body 550 isoriented in a first position such that the ports 560 a, 560 c providefluid communication between the input flow path 750 and the first egressflow path 752. In some embodiments, the port 560 b is directed towardthe inner sidewall 242 of the housing 510, which can substantiallyprevent fluid flow out of the port 262 b. Additionally, the valve body550 can substantially block the second egress flow path 754, therebysubstantially preventing fluid flow through the second egress flow path754.

Accordingly, in certain embodiments, in the first operationalconfiguration, the valve assembly 500 can accept fuel via the burnerinput 230, can direct the fuel along the input flow path 750, throughthe valve body 550, through the first egress flow path 752 and out thefirst egress aperture 694. As described above, fuel flowing through thefirst egress aperture 694 can progress through the passage defined bythe recess 688 and the cover 605. The fuel can flow through the gap 740and the outer flow path 742 defined by the first and second nozzlemembers 600, 625, and can be dispensed via the output 734 of the secondnozzle member 625.

In certain embodiments, when the valve assembly 500 is in the firstoperational configuration, the valve body 550 is oriented such that theport 555 a (see FIG. 17C) is in fluid communication with the ODS input220 and the port 555 b (see FIG. 17C) is in fluid communication with thefirst ODS output 222. The valve body 550 can thus function similarly tothe valve body 250, and can direct fuel from the ODS input 220 to thefirst ODS output 222.

FIG. 22B illustrates an embodiment of the valve assembly 500 in thesecond operational configuration. In the second configuration, the valvebody 550 is oriented in a second position such that the ports 560 a, 560b provide fluid communication between the input flow path 750 and thesecond egress flow path 754. In some embodiments, the port 560 c isdirected toward the inner sidewall 242 of the housing 510, which cansubstantially prevent fluid flow out of the port 560 c. Additionally,the valve body 550 can substantially block the first egress flow path752, thereby substantially preventing fluid flow through the firstegress flow path 752.

Accordingly, in certain embodiments, in the second operationalconfiguration, the valve assembly 500 can accept fuel via the burnerinput 230, can direct the fuel along the input flow path 750, throughthe valve body 550, through the second egress flow path 754 and out thesecond egress aperture 700. Fuel flowing through the second egressaperture 700 can progress through the first nozzle member 600 and can bedispensed by the output 717.

In certain embodiments, when the valve assembly 500 is in the secondoperational configuration, the valve body 550 is oriented such that theport 555 b (see FIG. 17C) is in fluid communication with the ODS input220 and the port 555 a (see FIG. 17C) is in fluid communication with thesecond ODS output 224. The valve body 550 can thus function similarly tothe valve body 250, and can direct fuel from the ODS input 220 to thesecond ODS output 224.

With reference to FIG. 23A, in certain embodiments, the first and secondnozzle members are 600, 625 are positioned to deliver fuel to the mixingcompartment 660. In the illustrated embodiment, the valve assembly 500is in the first configuration such that fuel can be dispensed via thesecond nozzle member 625. The flow channels or windows 665 arerelatively small and allow a relatively small amount and/or a relativelylow flow rate of air therethrough. In some embodiments, as fuel isdispensed from the second nozzle member 625, air is drawn through thewindows 665. In some embodiments, the size of the windows 665 is suchthat the amount of air drawn into the mixing compartment 660 is adequateto form an air-fuel mixture that combusts as a substantially yellowflame (e.g., a flame of which a substantial portion is yellow) at theburner 135. In some embodiments, the valve assembly 500 is configured todispense natural gas at a first pressure so as to produce asubstantially yellow flame at the burner 135.

With reference to FIG. 23B, the valve assembly 500 can be configured totransition to the second operational configuration. In certainembodiments, the shaft 290 is rotated, thereby rotating the valve body550, which rotates the cam 580. In some embodiments, rotation of the cam580 translates the rod 586 within the slot 642 defined by the extension640, thereby imparting rotational movement to the cover 620. Movement ofthe cover 620 can rotate the screens 634 relative to openings in theconduit 650, thereby adjusting the size of the windows 665. For example,prior to rotation of the screens 634, the windows 665 can define a firstflow area, and subsequent to rotation of the screens 634, the windows665 can define a second flow area which varies from the first flow area.

In some embodiments, when the valve assembly 500 is in the secondoperating configuration, the windows 665 are relatively larger than theyare when the valve assembly 500 is in the first configuration. In someembodiments, the size of the windows 665 changes by a predeterminedamount between the first and second configurations.

In some embodiments, the size of the windows 665 is such that, when thevalve assembly 500 is in the second configuration, the amount of airdrawn into the mixing compartment 660 is adequate to form an air-fuelmixture that combusts as a substantially yellow flame at the burner 135.In some embodiments, the valve assembly 500 is configured to dispenseliquid propane at a second pressure so as to produce a substantiallyyellow flame at the burner 135. In some embodiments, the second pressureat which liquid propane is dispensed is larger than the first pressureat which natural gas is dispensed when the valve assembly is in thefirst configuration.

The valve assembly 500 can transition from the second operationalconfiguration to the first operational configuration. In certainembodiments, the screens 634 occlude a larger portion of the openingsdefined by the conduit 650 when the valve assembly 500 transitions fromthe second operational configuration to the first operationalconfiguration, thus reducing the size of the windows 665.Advantageously, the valve assembly 500 can transition between the firstand second operating configurations as desired with relative ease.Accordingly, a user can select whichever configuration is appropriatefor the fuel source with which the valve assembly 500, and moregenerally, the heater 10, is to be used.

FIG. 24 illustrates another embodiment of a valve assembly 700 similarto the valve assembly 500. The valve assembly 700 can include a housing710 that defines a channel housing 720. The valve assembly 700 caninclude a cam 730 from which a rod 735 extends to interact with thecover 620.

With reference to FIG. 25, in certain embodiments, the channel housing720, can define a first channel 740 configured to direct fuel to thefirst nozzle member 600, and can define a second channel 742 configuredto direct fuel to the second nozzle member 625. In some embodiments, thefirst and second channels 740, 742 are formed via multiple drillings,and access holes 745 formed during the drillings are subsequentlyplugged. In some embodiments, the first and second channels 740, 742extend from substantially opposite sides of a chamber 750.

With reference to FIG. 26, in some embodiments, a valve member or valvebody 760 compatible with embodiments of the valve assembly 700 definesan upper flow channel 762 and a lower flow channel 764 that aresimilarly shaped, and can be formed by drilling into a body of the valvebody 760. Each flow channel 762, 764 can redirect fluid flow at an angleof about 90 degrees. Other angles are possible. In some embodiments,respective ingress ports and egress ports of the flow channels 762, 764are substantially coplanar along a plane running through a longitudinalaxis of the valve body 760. The ingress and/or egress ports can also beoffset from each other.

Any suitable combination of the features discussed with respect to anyof the valve assemblies 140, 500, 700 can be incorporated into any ofthe other valve assemblies 140, 500, 700. For example, in someembodiments, a portion of the protrusion 570 may be removed from thevalve body 550 and used in place of the valve body 250 in the valveassembly 140. Additionally, in some embodiments, the first and secondnozzle members 600, 625 can replace the first and second nozzle members320, 322 in the valve assembly 140.

Reference throughout this specification to “one embodiment” or “anembodiment” means that a particular feature, structure or characteristicdescribed in connection with the embodiment is included in at least oneembodiment. Thus, appearances of the phrases “in one embodiment” or “inan embodiment” in various places throughout this specification are notnecessarily all referring to the same embodiment. Furthermore, theparticular features, structures or characteristics of any embodimentdescribed above may be combined in any suitable manner, as would beapparent to one of ordinary skill in the art from this disclosure, inone or more embodiments.

Similarly, it should be appreciated that in the above description ofembodiments, various features of the inventions are sometimes groupedtogether in a single embodiment, figure, or description thereof for thepurpose of streamlining the disclosure and aiding in the understandingof one or more of the various inventive aspects. This method ofdisclosure, however, is not to be interpreted as reflecting an intentionthat any claim require more features than are expressly recited in thatclaim. Rather, as the following claims reflect, inventive aspects lie ina combination of fewer than all features of any single foregoingdisclosed embodiment. Thus, the claims following the DetailedDescription are hereby expressly incorporated into this DetailedDescription, with each claim standing on its own as a separateembodiment.

What is claimed is:
 1. A dual fuel heating assembly comprising: a valveassembly comprising a valve housing, a valve body, and a nozzle, thevalve housing comprising: a first fuel input for receiving fuel ofeither a first fuel type or a second fuel type; and a second fuel inputfor receiving fuel of either the first fuel type or the second fueltype; the valve body rotatably positioned with the housing andconfigured to direct fuel from the first fuel input through the valvebody to the nozzle in a first manner when in a first state, and in asecond manner different from the first manner when in a second state,the valve body configured to rotate between the first state and thesecond state; a burner; a burner delivery conduit comprising a tubularmember having: a first end, the nozzle being positioned within thetubular member at the first end to direct fuel into the burner deliveryconduit, the first end having one or more holes positioned on acircumferential wall of the tubular member, the one or more holesconfigured to allow air to enter the burner delivery conduit and mixwith the fuel; and a second end positioned to direct the mixed air andfuel to the burner for combustion of the mixed air and fuel at theburner; an air shutter comprising a cylindrical body positioned along acircumference of the tubular member at the first end, the air shutterrotatable with respect to the tubular member to cover at least a portionof one or more of the holes in the circumferential wall of the tubularmember to thereby adjust air flow into the burner delivery conduit; anda control knob operatively coupled to the valve body and the air shuttersuch that rotation of the control knob controls the state of the valvebody, the position of the air shutter and the air flow into the tubularmember of the burner delivery conduit.
 2. The dual fuel heating assemblyof claim 1, wherein the air shutter further comprises a radialprojection with a radial slot that extends radially outward from thecylindrical body.
 3. The dual fuel heating assembly of claim 2, furthercomprising a rod positioned within the slot and operatively coupled tothe valve body.
 4. The dual fuel heating assembly of claim 1, whereinthe circumferential wall surrounds the nozzle.
 5. The dual fuel heatingassembly of claim 4, wherein the air shutter further surrounds thenozzle.
 6. The dual fuel heating assembly of claim 1, wherein the nozzlehas a first nozzle outlet and a second nozzle outlet and the valve bodyis configured to direct fuel from the first fuel input through the valvebody to the first nozzle outlet when in the first state, and to directfuel from the first input through the valve body to the second nozzleoutlet when in the second state.
 7. The dual fuel heating assembly ofclaim 6, wherein the valve housing further comprises a first oxygendepletion sensor (ODS) outlet and a second ODS outlet, the valve bodyconfigured to direct fuel from the second fuel input through the valvebody to the first ODS outlet when in the first state, and to direct fuelfrom the second input through the valve body to the second ODS outletwhen in the second state.
 8. The dual fuel heating assembly of claim 1,wherein the valve housing further comprises a first oxygen depletionsensor (ODS) outlet and a second ODS outlet, the valve body configuredto direct fuel from the second fuel input through the valve body to thefirst ODS outlet when in the first state, and to direct fuel from thesecond input through the valve body to the second ODS outlet when in thesecond state.
 9. The dual fuel heating assembly of claim 1, wherein theair shutter comprises one or more screens separated by one or more gaps.10. The dual fuel heating assembly of claim 1, wherein the valve bodycomprises a first port and a second port, the valve body configured todirect fuel from the first fuel input through the first port in thevalve body to the nozzle when in the first state, and to direct fuelfrom the first input through the second port in the valve body to thenozzle when in the second state.
 11. The dual fuel heating assembly ofclaim 1, wherein the burner delivery conduit is a separate piece fromthe burner.
 12. A dual fuel heating assembly comprising: a valveassembly comprising a valve housing, a valve body, and a nozzle, thevalve housing comprising: a first fuel input for receiving fuel ofeither a first fuel type or a second fuel type; and a second fuel inputfor receiving fuel of either the first fuel type or the second fueltype; the valve body rotatably positioned with the housing andconfigured to direct fuel from the first fuel input through the valvebody to the nozzle in a first manner when in a first state, and in asecond manner different from the first manner when in a second state,the valve body configured to rotate between the first state and thesecond state; a burner; a burner delivery conduit comprising a tubularmember having: a first end, the nozzle being positioned within thetubular member at the first end to direct fuel into the burner deliveryconduit, the first end having one or more holes positioned on an outersurface of the tubular member and surrounding the nozzle, the one ormore holes configured to allow air to enter the burner delivery conduitand mix with the fuel; and a second end configured to direct the mixedair and fuel to the burner for combustion of the mixed air and fuel atthe burner; an air shutter comprising a cylindrical body surrounding thetubular member at the first end, the air shutter rotatable about thetubular member to cover at least a portion of one or more of the holesin the outer surface of the tubular member to thereby adjust air flowinto the burner delivery conduit; and a control knob operatively coupledto the valve body and the air shutter such that rotation of the controlknob controls the state of the valve body, the position of the airshutter and the air flow into the tubular member of the burner deliveryconduit.
 13. The dual fuel heating assembly of claim 12, wherein the airshutter further comprises a radial projection with a radial slot thatextends radially outward from the cylindrical body.
 14. The dual fuelheating assembly of claim 13, further comprising a rod positioned withinthe slot and operatively coupled to the valve body.
 15. The dual fuelheating assembly of claim 12, wherein the nozzle has a first nozzleoutlet and a second nozzle outlet and the valve body is configured todirect fuel from the first fuel input through the valve body to thefirst nozzle outlet when in the first state, and to direct fuel from thefirst input through the valve body to the second nozzle outlet when inthe second state.
 16. The dual fuel heating assembly of claim 15,wherein the valve housing further comprises a first oxygen depletionsensor (ODS) outlet and a second ODS outlet, the valve body configuredto direct fuel from the second fuel input through the valve body to thefirst ODS outlet when in the first state, and to direct fuel from thesecond input through the valve body to the second ODS outlet when in thesecond state.
 17. The dual fuel heating assembly of claim 12, whereinthe valve housing further comprises a first oxygen depletion sensor(ODS) outlet and a second ODS outlet, the valve body configured todirect fuel from the second fuel input through the valve body to thefirst ODS outlet when in the first state, and to direct fuel from thesecond input through the valve body to the second ODS outlet when in thesecond state.
 18. The dual fuel heating assembly of claim 12, whereinthe air shutter comprises one or more screens separated by one or moregaps.
 19. The dual fuel heating assembly of claim 12, wherein the valvebody comprises a first port and a second port, the valve body configuredto direct fuel from the first fuel input through the first port in thevalve body to the nozzle when in the first state, and to direct fuelfrom the first input through the second port in the valve body to thenozzle when in the second state.
 20. The dual fuel heating assembly ofclaim 12, wherein the burner delivery conduit is a separate piece fromthe burner.